that is measured in the oil sample will be dissolved water. This should be less than .05%. If
it is greater than .05%, the oil in the system should be drained and replaced.
Particle Contamination- Excess contamination in a hydraulic system will greatly shorten the
life of pumps and motors. Your oil sample analysis will show the number of particles per
milliliter greater than a given micron size. The number of particles in your sample should be
less than the following:
Particle Size No. of Particles/Milliliter
10 micron or larger 3,000
20 micron or larger 300
30 micron or larger 100
40 micron or larger 30
50 micron or larger 10
100 micron or larger 1
If your oil sample shows numbers greater than in the chart, your hydraulic system is
contaminated. The system should be checked for broken or torn filters, plugged filters,
stuck filter bypass valves and so forth. Continued operation with particle counts greater
than those shown in the chart will result in short pump and motor life.
Copper Particle Counts- The oil sample analysis should include a copper particle count in
parts/million. This number should normally be less than 100. A high copper particle count
indicates that a gear pump or motor is rapidly deteriorating. A count of 200 or more would
be cause for concern. The most important thing to look for is a sudden increase in the
copper particle count. This indicates that a gear pump or motor has suddenly begun
deteriorating and a catastrophic failure can be expected shortly.
VISCOSITY:
Oils are available in various grades (viscosities). The ISO (International Organization for
Standardization) viscosity classification system is currently being adopted. The ISO grade
applies strictly to viscosity and does NOT imply type of oil. (engine, anti-wear, hydraulic,
gear.etc.). A viscosity grade should be selected that will meet the minimum start up
temperature requirement and the maximum operating hydraulic oil temperature.
This machine is factory filled with Koehring spec 805 hydraulic fluid that is
acceptable for start-up at ambient temperatures of 20°F and should not be
operated above a hydraulic reservoir temperature of 200°F. If these limits are
exceeded damage can result. For operation outside these ranges, select the
proper hydraulic fluid from the charts on this and the following pages or from a
reputable supplier.
295P/N 12261-683 REVISED: January 2015
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